Vocabulary
Similar motion: movement of two melodic lines in the same direction, but with the interval between them changing
Contrary motion: movement of two melodic lines in the opposite direction
Oblique motion: movement of one melodic line while the other remains at the same pitch
Parallel motion: moving in the same direction keeping the same interval between them
Open Voicing: more than an octave between tenor and soprano
Closed Voicing: less than an octave between tenor and soprano